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Income Taxes - Schedule of Components of Deferred Tax Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets    
Federal and state net operating loss carryforwards $ 27,567 $ 21,262
Research and development tax credits 4,887 4,140
Other 748 488
Gross deferred tax assets 33,202 25,890
Less: valuation allowance (33,141) (25,841)
Total deferred tax assets 61 49
Deferred tax liabilities    
Depreciation (61) (49)
Total deferred tax liabilities $ (61) $ (49)